Note: Compatible With Most Mossberg 500/590 12ga Shotguns. The forend included in this package is compatible with most Mossberg Shotguns with a (removable forend) with 7 3/4" action slide any Mossberg Shotguns, newer than 2006 should be checked to insure that it has a removable forend. Note: Will Not Fit Post-2006 500A model with 6.75" Slide Action Tube. This Forend Only Fits 7 3/4" Slide Action Tubes Measure Before You Buy.